Project ttcn3-mgw-test

Run the ttcn3-mgw-test testsuite from
docker-playground.git.
If this job ends in -latest, the job runs the latest stable versions of the Osmocom stack.
Otherwise the nightly builds.
Generated with the jenkins-job-builder config introduced in
OS#3268.
See
TTCN3 Testsuite for more information.